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04-19-2008, 11:21 AM   #1
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is my 50-135 too soft a 2.8

I have been happy with my 50-135. Lately however, I have noticed it to be a little fuzzy at 2.8 and 135mm.

attached are some photos with 100% crops. let me know if your 50-135 is this soft or if it should be sharper at 135mm and 2.8


Last edited by qksilver; 05-24-2008 at 04:19 AM.
04-19-2008, 06:16 PM   #2
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seems a bit soft or out of focus

what was your shutter speed?
SR on or off?
Using the lens hood? (looks like strong light coming in from upper right)

Mine seem a lot sharper, trying to look for some now to post... from the zoo

I have some shots at 135 f/5.6 that seem soft like this, but it was at the beach and the bright sun was casting glare at a right angle to the lens, not sure whether that affected the optics, or messed with the AF or if just that all that glare made everything look fuzzy behind it.

I'll try to find the images at 2.8 that are sharp...

Brian
04-19-2008, 06:37 PM   #3
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shutter speed was 1/250 shake reduction was on
lens hood was used
04-20-2008, 08:27 AM   #4
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It's really hard to make a judgement on photos like that, the subject could have moved a bit towards the camera, etc...
If you really want to test it put it on a tripod with SR off & shoot a still subject like a sign or billboard.

04-20-2008, 08:39 AM   #5
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Yep that is the best controlled (tripod) also what was metering ? where was the focal point ? ISO ? ........... seems soft you are right.
04-20-2008, 09:13 AM   #6
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I wonder if its focus accuracy or "softness"...? I can't comment on the lens as I've not seen it in action.

Sharpness is also sometimes affected by focus distance, something largely ignored by reviewers...
04-20-2008, 01:15 PM   #7
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can someone post some 100% crops at 2.8 of their 50-135 so i can compare??
04-20-2008, 01:24 PM   #8
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the second crop looks way out of focus not just softness...try to post the whole images in full size to see if we spot where does it focus

04-20-2008, 02:10 PM   #9
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this is the largest i could get them on flickr

04-20-2008, 02:12 PM   #10
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04-20-2008, 10:30 PM   #11
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You have a hair thin depth of field at f/2.8, and that might be misleading you. It almost appears to me in the larger Flickr image that the focus is on the papers in the lady's left hand, a bit in front of her. If you mentally draw an X from corner to corner, the geometric center of the image, where the focus point is, is on the papers. As a check, open the original on your computer, and check the area of the papers for focus accuracy.
04-20-2008, 11:29 PM   #12
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Yea I agree with Albert, the focus seems to come up a bit ahead of the person. Front focusing?

Though I'd be sure before anything as AF sensors do like to focus more on sharp edges and distinct lines.
04-21-2008, 03:46 AM   #13
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QuoteOriginally posted by qksilver Quote
can someone post some 100% crops at 2.8 of their 50-135 so i can compare??
K10D, no SR, tripod mount, center of image, point auto focus on the center of cross, ISO 100, PEF to bmp by Photoshop SC3-camera raw at default settings.
1st crop @135mm / f2,8
2nd crop @135mm / f5,6
I find this behavior normal to fast telephoto lens. Actualy seems better than a sigma 50-150 I'm testing these days (I'll post more on the comparison after a few days).
Note that at 2,8 depth of field is very shallow @135mm so small front-back focus issues or exact point of focus become serious.
Attached Images
   

Last edited by gkopeliadis; 04-21-2008 at 03:52 AM.
04-21-2008, 06:55 PM   #14
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Thanks for the 100% crops. That helps. Mine is about that soft at 2.8 as well so I am going to assume this is normal unless someone disagrees
04-21-2008, 07:01 PM   #15
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strictly on Photozone charts, it shouldn't be that much softer in the center at least
Pentax SMC-DA* 50-135mm f/2.8 ED [IF] SDM - Review / Test Report
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